US20130141767A1 - Print Verification Database Mechanism - Google Patents
Print Verification Database Mechanism Download PDFInfo
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- US20130141767A1 US20130141767A1 US13/311,772 US201113311772A US2013141767A1 US 20130141767 A1 US20130141767 A1 US 20130141767A1 US 201113311772 A US201113311772 A US 201113311772A US 2013141767 A1 US2013141767 A1 US 2013141767A1
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- print medium
- print verification
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
- H04N1/00026—Methods therefor
- H04N1/00029—Diagnosis, i.e. identifying a problem by comparison with a normal state
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
- G06T7/0006—Industrial image inspection using a design-rule based approach
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
- H04N1/00005—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for relating to image data
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
- H04N1/00026—Methods therefor
- H04N1/00042—Monitoring, i.e. observation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
- H04N1/00026—Methods therefor
- H04N1/00045—Methods therefor using a reference pattern designed for the purpose, e.g. a test chart
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
- H04N1/00026—Methods therefor
- H04N1/0005—Methods therefor in service, i.e. during normal operation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
- H04N1/00071—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for characterised by the action taken
- H04N1/00082—Adjusting or controlling
- H04N1/00087—Setting or calibrating
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10004—Still image; Photographic image
- G06T2207/10008—Still image; Photographic image from scanner, fax or copier
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30108—Industrial image inspection
- G06T2207/30124—Fabrics; Textile; Paper
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30176—Document
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/6072—Colour correction or control adapting to different types of images, e.g. characters, graphs, black and white image portions
Definitions
- This invention relates generally to the field of printing systems. More particularly, the invention relates to image processing in a printing system.
- media such as paper may be pre-printed in an offset press, then run through a digital press/printer in order to add variable information.
- Examples of this type of printing include check printing, insurance policies, receipts, etc. Data printed on these forms is particularly important since the information is often used to guarantee traceability, facilitate record keeping, etc.
- check printing it is crucial that each individual document be readily identifiable and the correct number is printed in a proper location. Accordingly, it is desirable to quickly and easily verify defects in information printed on the medium.
- PVSs print verification system
- Such printer defects are typically discovered using a print verification system (PVS).
- PVSs typically operate by digitizing printed pages using means such as photography, video, or scanning to generate test images. Subsequently, these test images are compared to source images that are known to be correct.
- the source images may be obtained from an input stream to be received at the printer, scanned after printing, or by a number of other methods.
- PVSs Another limitation to current PVSs is a lack of a wider categorization of printed defects that includes a quality metric. For example, in some cases such as in the printing of Japanese Hiragana characters, pixel fidelity is required. However in other cases, such as in a jpeg compressed image, a more broad quality measure may be more appropriate.
- a method in one embodiment, includes reading image data from a print medium and performing image processing on the image data by querying a database to verify that each object to be included on the print medium appears on the medium in a manner in which it is supposed to appear.
- a print verification system includes one or more image readers to read image data from a print medium, a database including one or more objects that are to be included on the print medium and a processor to perform image processing on the read image data by querying the database to verify that each object to be included on the print medium appears on the print medium in a manner in which it is supposed to appear.
- FIG. 1 illustrates one embodiment of a printing system
- FIG. 2 illustrates one embodiment of a PVS
- FIG. 3 illustrate embodiments of PVS rules
- FIG. 4 is a flow diagram illustrating one embodiment of operation of a PVS.
- FIG. 1 illustrates one embodiment of a printing system 100 .
- Printing system 100 includes a print application 110 , a server 120 and a printer 130 .
- Print application 110 makes a request for the printing of a document.
- print application 110 provides a print job data stream to print server 120 in a presentation format (e.g., Advanced Function Printing, Post Script, etc.)
- a presentation format e.g., Advanced Function Printing, Post Script, etc.
- Print server 120 processes pages of output that mix all of the elements normally found in presentation documents(e.g., text in typographic fonts, electronic forms, graphics, image, lines, boxes, and bar codes).
- the data stream is composed of architected, structured fields that describe each of these elements.
- printer 130 includes a control unit 140 , print engine 160 and print verification system (PVS) 180 .
- print server 120 communicates with control unit 140 in order to integrate with the capabilities and command set of printer 130 , and to facilitate interactive dialog between the print server 120 and printer 130 .
- the dialog between the print server 120 and printer 130 is provided according to a device-dependent bi-directional command/data stream.
- Control unit 140 processes and renders objects received from print server 120 and provides sheet maps for printing to print engine 160 .
- control unit 140 includes a multitude (e.g., ten) of compute node machines, with each node having two or more parallel page output handlers (POH's).
- POH's parallel page output handlers
- PVS 180 analyzes pages printed by print engine 160 in order to identify any defects on the page.
- FIG. 2 illustrates one embodiment of PVS 180 .
- PVS 180 operates independent of control unit 140
- PVS 180 includes image readers 210 , memory 220 , processor 230 and database 250 .
- readers 210 are image line scanners that are positioned to read data printed on each side of a medium that leaves the print engine 160 .
- memory 220 and processor 230 comprise a digital computer that is implemented to operate print verification and communicate with control unit 140 via an input/output interface.
- database 250 is implemented by PVS 180 to provide print verification.
- database 250 includes various objects, rules and criteria metrics. Specifically, database 250 stores objects that are to be applied on each printed page of a print job, rules for when, where and how the objects should appear, and a criteria metric for the desired quality of the printed objects. Thus, whenever an image from print engine 160 is being verified for correctness, each of the objects that are supposed to be on the page is queried from the database.
- Database objects may include images, line art, barcodes, text, etc.
- rules may include information regarding the placement of an object, object combinations (e.g., Object A and Object B always together), color (e.g., Object C has CMYK color values (33, 255, 255, 10)), etc.
- FIG. 3A illustrates one embodiment of a database placement rule indicating that a logo should be placed at coordinates ( 30 , 10 ) of a printed page
- FIG. 3B illustrates one embodiment of a database combinations rule indicating Object A and Object B always together.
- the criteria metric may be represented in various ways. Examples include broad, detail and legibility quality descriptions.
- broad category general properties of an object are examined such as proportion, color, sheet cuts, or shifted planes.
- detail category single pixel precision can be the goal. This category is useful in certain fonts (e.g., Kanji) where a single pixel can change the meaning of a character.
- the legibility category would be useful in an application such as determining whether or not a barcode is likely to be readable by a scanning device.
- FIG. 4 is a flow diagram illustrating one embodiment of operation of a PVS.
- database 250 is generated.
- database 250 is automatically generated without user-intervention.
- database 250 is generated by analyzing page data at some point in the printing process before the ink is applied to the medium (e.g., as the page data is being sent to the printer control unit).
- database 250 generation involves user-intervention.
- a printer 130 operator assembles the database by locating important objects for verification, cropping them as necessary, and storing them. Corresponding rules and quality criteria for each object are also entered into the database by the operator.
- a print job is initiated, resulting in the production of print pages at print engine 160 .
- the printed pages are scanned by readers 210 .
- PVS 180 processes the images read by readers 210 .
- image processing includes comparing the scanned images and source images by performing various operations on the images.
- a normalization process may be implemented. For instance, there may be a difference in brightness between the scanned images and source images, thus normalization is performed to compensate for the differences. Additionally, paper stretching and compressing during the printing process. Therefore, an alignment process (e.g., coordinate transformation) may be implemented to normalize the scanned images and source images.
- an alignment process e.g., coordinate transformation
- database 250 is implemented to provide print verification.
- PVS 180 verifies each object on a page according to the rules and criteria specified in database 250 .
- PVS 180 may verify that the logo object is placed at coordinates ( 30 , 10 ) of the verified page, that Object A and Object B are together on the page and/or, Object C has CMYK color values (33, 255, 255, 10)).
- database 250 may be used to verify the output of a printer simulator that produces digital copies of a page(s) on a digital print medium instead of pages printed on a physical medium, such as paper.
- processing blocks 440 and 450 may be performed as a combined process and/or the order of processing may be reversed.
- one or more conventional verification processes may also be implemented to detect print page defects. For example, pixel by pixel comparison may be performed to detect excess or missing ink and stray marks, as well as an inspection of regions of variable content for which locations may vary on each print job.
- the above-described PVS uses a catalog of objects that enables a discovery of information about a defective printed page.
- the catalog may provide information, for example as to whether a particular object was printed, the object was positioned in an incorrect location on a page, the object colors are inaccurate and/or the object has been printed with desired quality, the legibility of an object such as a barcode, or whether the value encoded in the barcode matches the value in another object on the page.
- Embodiments of the invention may include various steps as set forth above.
- the steps may be embodied in machine-executable instructions.
- the instructions can be used to cause a general-purpose or special-purpose processor to perform certain steps.
- these steps may be performed by specific hardware components that contain hardwired logic for performing the steps, or by any combination of programmed computer components and custom hardware components.
- Elements of the present invention may also be provided as a machine-readable medium for storing the machine-executable instructions.
- the machine-readable medium may include, but is not limited to, floppy diskettes, optical disks, CD-ROMs, and magneto-optical disks, ROMs, RAMs, EPROMs, EEPROMs, magnetic or optical cards, propagation media or other type of media/machine-readable medium suitable for storing electronic instructions.
- the present invention may be downloaded as a computer program which may be transferred from a remote computer (e.g., a server) to a requesting computer (e.g., a client) by way of data signals embodied in a carrier wave or other propagation medium via a communication link (e.g., a modem or network connection).
- a remote computer e.g., a server
- a requesting computer e.g., a client
- a communication link e.g., a modem or network connection
Abstract
Description
- This invention relates generally to the field of printing systems. More particularly, the invention relates to image processing in a printing system.
- In the printing industry, it is sometimes necessary to process media multiple times in order to create a final product. For example, media such as paper may be pre-printed in an offset press, then run through a digital press/printer in order to add variable information. Examples of this type of printing include check printing, insurance policies, receipts, etc. Data printed on these forms is particularly important since the information is often used to guarantee traceability, facilitate record keeping, etc. In applications such as check printing, it is crucial that each individual document be readily identifiable and the correct number is printed in a proper location. Accordingly, it is desirable to quickly and easily verify defects in information printed on the medium.
- Such printer defects are typically discovered using a print verification system (PVS). PVSs typically operate by digitizing printed pages using means such as photography, video, or scanning to generate test images. Subsequently, these test images are compared to source images that are known to be correct. The source images may be obtained from an input stream to be received at the printer, scanned after printing, or by a number of other methods.
- However, current solutions to the problem of finding defects on pages outputted from a printer are limited in several ways. For instance, most approaches use a general pixel by pixel comparison. The drawback to such an approach is that no knowledge of individual objects on a page is used in the determination of whether or not a page is defective. Thus, there is an inability to identify incorrect placement of objects on a page.
- Another limitation to current PVSs is a lack of a wider categorization of printed defects that includes a quality metric. For example, in some cases such as in the printing of Japanese Hiragana characters, pixel fidelity is required. However in other cases, such as in a jpeg compressed image, a more broad quality measure may be more appropriate.
- Moreover, current PVSs assume that the system control unit is correct. Thus, there is no way to verify control unit errors. Also, generating application errors and operator errors (e.g., the wrong form being fed to the printer) cannot be detected in current PVS systems.
- Accordingly, an improved printer verification mechanism is desired.
- In one embodiment, a method is disclosed. The method includes reading image data from a print medium and performing image processing on the image data by querying a database to verify that each object to be included on the print medium appears on the medium in a manner in which it is supposed to appear.
- In another embodiment, a print verification system includes one or more image readers to read image data from a print medium, a database including one or more objects that are to be included on the print medium and a processor to perform image processing on the read image data by querying the database to verify that each object to be included on the print medium appears on the print medium in a manner in which it is supposed to appear.
- A better understanding of the present invention can be obtained from the following detailed description in conjunction with the following drawings, in which:
-
FIG. 1 illustrates one embodiment of a printing system; -
FIG. 2 illustrates one embodiment of a PVS; -
FIG. 3 illustrate embodiments of PVS rules; and -
FIG. 4 is a flow diagram illustrating one embodiment of operation of a PVS. - A print verification system is described. In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. In other instances, well-known structures and devices are shown in block diagram form to avoid obscuring the underlying principles of the present invention.
- Reference in the specification to “one embodiment” or “an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. The appearances of the phrase “in one embodiment” in various places in the specification are not necessarily all referring to the same embodiment.
-
FIG. 1 illustrates one embodiment of aprinting system 100.Printing system 100 includes aprint application 110, aserver 120 and aprinter 130.Print application 110 makes a request for the printing of a document. In one embodiment,print application 110 provides a print job data stream to printserver 120 in a presentation format (e.g., Advanced Function Printing, Post Script, etc.) - Print
server 120 processes pages of output that mix all of the elements normally found in presentation documents(e.g., text in typographic fonts, electronic forms, graphics, image, lines, boxes, and bar codes). In one embodiment, the data stream is composed of architected, structured fields that describe each of these elements. - According to one embodiment,
printer 130 includes acontrol unit 140,print engine 160 and print verification system (PVS) 180. In such an embodiment,print server 120 communicates withcontrol unit 140 in order to integrate with the capabilities and command set ofprinter 130, and to facilitate interactive dialog between theprint server 120 andprinter 130. In one embodiment, the dialog between theprint server 120 andprinter 130 is provided according to a device-dependent bi-directional command/data stream. -
Control unit 140 processes and renders objects received fromprint server 120 and provides sheet maps for printing toprint engine 160. In such an embodiment,control unit 140 includes a multitude (e.g., ten) of compute node machines, with each node having two or more parallel page output handlers (POH's). -
PVS 180 analyzes pages printed byprint engine 160 in order to identify any defects on the page.FIG. 2 illustrates one embodiment ofPVS 180. In one embodiment, PVS 180 operates independent ofcontrol unit 140 PVS 180 includesimage readers 210,memory 220,processor 230 anddatabase 250. In one embodiment,readers 210 are image line scanners that are positioned to read data printed on each side of a medium that leaves theprint engine 160. In a further embodiment,memory 220 andprocessor 230 comprise a digital computer that is implemented to operate print verification and communicate withcontrol unit 140 via an input/output interface. - According to one embodiment,
database 250 is implemented by PVS 180 to provide print verification. In such an embodiment,database 250 includes various objects, rules and criteria metrics. Specifically,database 250 stores objects that are to be applied on each printed page of a print job, rules for when, where and how the objects should appear, and a criteria metric for the desired quality of the printed objects. Thus, whenever an image fromprint engine 160 is being verified for correctness, each of the objects that are supposed to be on the page is queried from the database. - Database objects may include images, line art, barcodes, text, etc., while rules may include information regarding the placement of an object, object combinations (e.g., Object A and Object B always together), color (e.g., Object C has CMYK color values (33, 255, 255, 10)), etc.
FIG. 3A illustrates one embodiment of a database placement rule indicating that a logo should be placed at coordinates (30, 10) of a printed page, whileFIG. 3B illustrates one embodiment of a database combinations rule indicating Object A and Object B always together. - The criteria metric may be represented in various ways. Examples include broad, detail and legibility quality descriptions. In the broad category, general properties of an object are examined such as proportion, color, sheet cuts, or shifted planes. In the detail category, single pixel precision can be the goal. This category is useful in certain fonts (e.g., Kanji) where a single pixel can change the meaning of a character. The legibility category would be useful in an application such as determining whether or not a barcode is likely to be readable by a scanning device.
-
FIG. 4 is a flow diagram illustrating one embodiment of operation of a PVS. Atprocessing block 410,database 250 is generated. In one embodiment,database 250 is automatically generated without user-intervention. In such an embodiment,database 250 is generated by analyzing page data at some point in the printing process before the ink is applied to the medium (e.g., as the page data is being sent to the printer control unit). - In another embodiment,
database 250 generation involves user-intervention. In this embodiment, aprinter 130 operator assembles the database by locating important objects for verification, cropping them as necessary, and storing them. Corresponding rules and quality criteria for each object are also entered into the database by the operator. - At
processing block 420, a print job is initiated, resulting in the production of print pages atprint engine 160. Atprocessing block 430, the printed pages are scanned byreaders 210. Atprocessing block 440,PVS 180 processes the images read byreaders 210. According to one embodiment, image processing includes comparing the scanned images and source images by performing various operations on the images. - In a further embodiment, a normalization process may be implemented. For instance, there may be a difference in brightness between the scanned images and source images, thus normalization is performed to compensate for the differences. Additionally, paper stretching and compressing during the printing process. Therefore, an alignment process (e.g., coordinate transformation) may be implemented to normalize the scanned images and source images.
- At
processing block 450,database 250 is implemented to provide print verification. As discussed above,PVS 180 verifies each object on a page according to the rules and criteria specified indatabase 250. For example,PVS 180 may verify that the logo object is placed at coordinates (30, 10) of the verified page, that Object A and Object B are together on the page and/or, Object C has CMYK color values (33, 255, 255, 10)). - In further embodiment,
database 250 may be used to verify the output of a printer simulator that produces digital copies of a page(s) on a digital print medium instead of pages printed on a physical medium, such as paper. In yet a further embodiment, processing blocks 440 and 450 may be performed as a combined process and/or the order of processing may be reversed. - Once database verification has been completed, one or more conventional verification processes may also be implemented to detect print page defects. For example, pixel by pixel comparison may be performed to detect excess or missing ink and stray marks, as well as an inspection of regions of variable content for which locations may vary on each print job.
- The above-described PVS uses a catalog of objects that enables a discovery of information about a defective printed page. Thus the catalog may provide information, for example as to whether a particular object was printed, the object was positioned in an incorrect location on a page, the object colors are inaccurate and/or the object has been printed with desired quality, the legibility of an object such as a barcode, or whether the value encoded in the barcode matches the value in another object on the page.
- Embodiments of the invention may include various steps as set forth above. The steps may be embodied in machine-executable instructions. The instructions can be used to cause a general-purpose or special-purpose processor to perform certain steps. Alternatively, these steps may be performed by specific hardware components that contain hardwired logic for performing the steps, or by any combination of programmed computer components and custom hardware components.
- Elements of the present invention may also be provided as a machine-readable medium for storing the machine-executable instructions. The machine-readable medium may include, but is not limited to, floppy diskettes, optical disks, CD-ROMs, and magneto-optical disks, ROMs, RAMs, EPROMs, EEPROMs, magnetic or optical cards, propagation media or other type of media/machine-readable medium suitable for storing electronic instructions. For example, the present invention may be downloaded as a computer program which may be transferred from a remote computer (e.g., a server) to a requesting computer (e.g., a client) by way of data signals embodied in a carrier wave or other propagation medium via a communication link (e.g., a modem or network connection).
- Throughout the foregoing description, for the purposes of explanation, numerous specific details were set forth in order to provide a thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the invention may be practiced without some of these specific details. Accordingly, the scope and spirit of the invention should be judged in terms of the claims which follow.
Claims (20)
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US9288360B1 (en) | 2015-02-02 | 2016-03-15 | Ricoh Company, Ltd. | Suppressing print verification of a printed page |
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US11341382B1 (en) * | 2021-04-01 | 2022-05-24 | Ricoh Company, Ltd. | Evaluation of print verification system |
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